CN116313374A - High temperature superconductive pancake coil for magnetic confinement device - Google Patents
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- 235000012771 pancakes Nutrition 0.000 title claims abstract description 102
- 239000000463 material Substances 0.000 claims abstract description 32
- 230000004907 flux Effects 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 239000011810 insulating material Substances 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000011796 hollow space material Substances 0.000 claims description 3
- 230000004927 fusion Effects 0.000 abstract description 17
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 229910021521 yttrium barium copper oxide Inorganic materials 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- BTGZYWWSOPEHMM-UHFFFAOYSA-N [O].[Cu].[Y].[Ba] Chemical compound [O].[Cu].[Y].[Ba] BTGZYWWSOPEHMM-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a high-temperature superconductive pancake coil for a magnetic restraint device, which comprises a single pancake coil, wherein the single pancake coil is a hollow pancake coil and comprises a hollow magnetic flux part and a coil part, the hollow magnetic flux part is wound by a conductor material radially outwards, the coil part comprises an inner coil (I) and an outer coil (O), the inner coil (I) is formed by winding a first conductive strip from inside to outside, the outer coil (O) is formed by winding a second conductive strip from inside to outside, and the first conductive strip is made of a high-temperature superconductive material. The high-temperature superconductive pancake coil for the magnetic confinement device can improve the magnetic confinement capacity of the high-temperature superconductive magnetic confinement device, is beneficial to realizing fusion or other high-temperature superconductive magnetic confinement devices requiring high plasma flux, and expands the design space of fusion reactors and other equipment.
Description
Technical Field
The invention belongs to the field of high-temperature superconducting magnets, and particularly relates to a high-temperature superconducting pancake coil for a magnetic confinement device.
Background
The strong magnetic field can be used to change the magnetic distance between the nuclei and the extra-nuclear electrons, thereby changing the properties of the material. The magnet with high-strength magnetic field is a core and basic device in many high and new technology application fields, and has wide and important application prospects in fields such as material science, particle physics, medical imaging, new energy sources, new traffic and the like. The solenoid magnet is an important component of the magnet and fusion device system, and has the function of generating and stabilizing plasma in the magnet device and ensuring safe and stable operation of the magnet and fusion device. The current solenoid magnet is affected by the strength of the low-temperature superconducting conductor, the general magnetic field strength is lower than 13T, the running performance of the magnet is not high, the radial occupied space is large, and the solenoid magnet is difficult to use in a compact strong magnetic field and a fusion reactor.
Since the first discovery of superconducting phenomenon in 1911 laboratories, superconducting materials and their applications have been one of the most active leading-edge research fields of modern science and technology. At present, a Central Solenoid (CS) magnet manufactured by low-temperature superconducting materials (LTS) in a magnetic restraint device is not compact enough in structure and large in occupied area, and the running temperature of a liquid helium temperature zone of the LTS magnet and a complicated power supply system greatly increase the running cost of the CS magnet and the maintenance difficulty of the system. The magnetic field is also difficult to exceed the strong field of 24T.
During the past decade, research on high-temperature superconducting power and magnet equipment represented by second-generation high-temperature superconducting tapes has been rapidly developed, and remarkable results are obtained in the fields of superconducting energy storage, superconducting motors, superconducting cables, superconducting current limiters, superconducting transformers, superconducting magnetic levitation, nuclear magnetic resonance and the like. The second generation YBCO (yttrium barium copper oxide) high-temperature superconducting material is regarded as a high-temperature superconducting material with application prospect in industry by virtue of higher critical current density and excellent magnetic field characteristics, and is applied to development of industrial products such as large-scale superconducting cables, high-power generators, motors, current limiters, energy storages, in particular strong magnets and the like.
With the development of high-temperature superconducting magnet technology with compact structure, high stability, low loss and low operation cost, the magnetic confinement device is expected to replace a low-temperature superconducting magnet in a fusion reactor or other linear plasma equipment requiring high plasma flux. However, the current field of high temperature superconducting magnets has not realized magnets that are truly applicable to fusion or other magnetic confinement devices requiring high plasma flux.
Disclosure of Invention
The invention provides a high-temperature superconductive pancake coil for a magnetic confinement device.
The invention provides a high-temperature superconductive pancake coil for a magnetic confinement device, which comprises the following components: the single pancake coil is a hollow pancake coil and comprises a hollow magnetic flux part and a coil part,
wherein,,
the hollow pancake coil forms the hollow magnetic flux part from a pancake hollow space with the center extending outwards in the radial direction;
the hollow magnetic flux part is wound into the coil part by a conductor material radially outwards, and the coil part comprises an inner coil I and an outer coil O;
the inner coil I is formed by winding a first conductive strip from inside to outside, a first lead end L1 is arranged at the inner end of the inner coil I, a second lead end L2 is arranged at the outer end of the inner coil I, and all turns of the inner coil I are separated by insulating materials;
the outer coil O is formed by winding a second conductive strip outside the inner coil I from inside to outside, a third lead end L3 is arranged at the inner end of the outer coil O, a fourth lead end L4 is arranged at the outer end of the outer coil O, and all the turns of the outer coil O are separated by the insulating material;
the first conductive strip is made of high-temperature superconducting materials;
the ampere-turns of the inner coil I and the ampere-turns of the outer coil O are the same;
the second lead end L2 and the third lead end L3 are positioned on the same ramp, the distance between the second lead end L2 and the third lead end L3 is not smaller than the coil turn distance, and the second lead end L2 and the third lead end L3 are separated by the insulating material, or the second lead end L2 and the third lead end L3 are positioned on adjacent ramps or are separated by a ramp;
the second conductive strip is a high-temperature superconducting material or a normal-temperature conductive material,
when the second conductive strip material is made of the high-temperature superconducting material, the height HH of the inner coil I is the same as the height H of the outer coil O;
when the second conductive strip material is made of the normal-temperature conductive material, the height HH of the inner coil I and the height H of the outer coil O satisfy: (H-HH)/HH is more than or equal to 1/3 and less than or equal to 2/3;
the winding direction of the external coil O is the same as or opposite to that of the internal coil I, the internal coil I is used for generating an axial magnetic field for magnetic restraint, and when the winding directions of the external coil O and the internal coil I are the same, reverse current is introduced into the external coil O and the internal coil I, or when the winding directions of the internal coil I and the external coil O are opposite, the two currents are introduced into the internal coil I and the external coil O.
Further, the method comprises the steps of,
the normal temperature conductive material is copper.
Further, the method comprises the steps of,
the single pancake coil is provided with a first top surface and a second top surface which are opposite to each other, and the first lead end L1 and the fourth lead end L4 are led out through leads attached to the first top surface or the second top surface and arranged in the radial direction of the coil.
Further, the method comprises the steps of,
the single cake coil is N, includes: single pancake coils A1, A2, …, AN, N are integers greater than 1,
the single pancake coils A1, A2, …, AN have the same symmetry axis and are sequentially arranged along the symmetry axis;
the single pancake coils A1, A2, …, AN have the same inner and outer radii R1, R2 of the inner coil I and the outer radius R3 of the outer coil O;
the external coils O of the single pancake coils A1, A2, … and AN are connected in parallel, and the internal coils I are connected in parallel.
Further, the method comprises the steps of,
let J1 be integer and 1 be less than or equal to J1 be less than or equal to N-1, the spacing between adjacent single cake coils AJ1 and AJ1+1 in the single cake coils A1, A2 and … and AN be D, and then D be less than or equal to H/2.
Further, the method comprises the steps of,
the number of the single pancake coils is NN, and the single pancake coils comprise: the single pancake coils B1, B2, …, BNN, NN are integers greater than 1,
the single pancake coils B1, B2, …, BNN have the same symmetry axis and are arranged in sequence along the symmetry axis;
the inner radius R1 and the outer radius R2 of the inner coil I of the single pancake coils B1, B2, …, BNN and the outer radius R3 of the outer coil O decrease in sequence;
the inner coil I and the outer coil O of the single pancake coils B1, B2 and … and BNN are respectively and independently connected with an independent power supply in an external mode.
Further, the method comprises the steps of,
let J2 be integer and 1 be less than or equal to J2 be less than or equal to NN-1, single pancake coils B1, B2, …, adjacent single pancake coils in BNN are single pancake coils BJ2 and BJ2+1, and let the inner radius of the inner coil I1 of single pancake coil BJ2 be RI11, the outer radius be RI12, the outer radius of the outer coil O1 be RO13, the outer radius of the inner coil I2 of single pancake coil BJ2+1 be RI22, the outer radius of the outer coil O2 be RO23, satisfy: RO23 is less than or equal to RO13 and RI11 is less than or equal to RI22.
Further, the method comprises the steps of,
RO23≤RI12。
the high-temperature superconductive cake-type coil for the magnetic confinement device improves the magnetic confinement capacity of the high-temperature superconductive magnetic confinement device, and when the external coil O adopts the existing normal-temperature conductor materials such as copper and the like, the high-temperature superconductive cake-type coil provides a protection function for physical impact from the outside of the coil and ensures that the external coil is convenient to assemble to the magnetic confinement device; compared with the existing CS coil, the first multi-pancake coil provided by the invention is more beneficial to realizing fusion or other high-temperature superconducting magnetic confinement devices requiring high plasma flux, and expands the design space of fusion reactors and other devices. In particular, the second multi-pancake coil provided by the invention solves the problem that the stray field or the error magnetic field of the frustum-shaped magnetic confinement device is difficult to counteract, and is beneficial to realizing ideal fusion or other equipment requiring high plasma flux.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a high temperature superconducting pancake coil configuration for a magnetic confinement device according to an embodiment of the invention;
FIG. 2 shows a schematic cross-sectional view of a high temperature superconducting pancake coil for a magnetic confinement device when the outer coil wound strip is copper in accordance with an embodiment of the present invention;
FIG. 3 illustrates a schematic diagram III of a side view of a high temperature superconducting pancake coil for a magnetic confinement device according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a side view of a high temperature superconducting pancake coil for a magnetic confinement device according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a schematic structure of a first high-temperature superconductive pancake coil for a magnetic confinement device, a single pancake coil, according to the present invention. Referring to fig. 1, the single pancake coil is a hollow pancake coil, and includes a hollow magnetic flux portion and a coil portion, wherein the hollow pancake coil forms a hollow magnetic flux portion from a pancake hollow space extending radially outward from the center of the hollow pancake coil, the hollow magnetic flux portion is wound into the coil portion from a conductor material radially outward, and a magnetic field required for fusion is generated in the hollow magnetic flux portion after the coil portion is connected with current. The size or radius of the hollow magnetic flux portion depends on the configuration of the magnetic confinement device and the desired magnetic field.
The coil part includes an inner coil I and an outer coil O. The inner coil I is formed by winding a first conductive strip from inside to outside, a first lead end L1 is arranged at the inner end of the inner coil I, a second lead end L2 is arranged at the outer end of the inner coil I, and all turns of the inner coil I are separated by insulating materials. The outer coil O is formed by winding a second conductive strip outside the inner coil I from inside to outside, and the winding direction of the outer coil O can be the same as that of the inner coil I as shown in fig. 1 or opposite to that of the inner coil I. The inner end of the outer coil O is provided with a third lead end L3, the outer end of the outer coil O is provided with a fourth lead end L4, and the coils of the outer coil O are also separated by insulating materials. The first conductive strip material adopts a high-temperature superconducting material such as YBCO, and the second conductive strip material can be a high-temperature superconducting material such as YBCO or a normal-temperature conductive material such as copper. The second lead end L2 and the third lead end L3 are positioned on the same ramp, the distance between the second lead end L2 and the third lead end L3 is not smaller than the coil turn spacing, and the second lead end L2 and the third lead end L3 can be separated by an insulating material. The second lead terminal L2 and the third lead terminal L3 may also be located at adjacent ramps or at intervals of one ramp. The ampere-turns of the inner coil I and the outer coil O are the same.
The single pancake coil has opposite first and second top surfaces, such as a top surface, and the first and fourth lead ends L1 and L4 are led out through leads attached to the first or second top surfaces of the single pancake coil and disposed radially of the coil.
The internal coil I is used to generate an axial magnetic field for magnetic confinement, but the internal coil I generates a first stray field or a first error magnetic field while generating the axial magnetic field, which affects the gas breakdown process in the magnetic confinement device. When the winding directions of the inner coil I and the outer coil O are the same, reverse current is introduced into the inner coil I and the outer coil O, or when the winding directions of the inner coil I and the outer coil O are opposite, the inner coil I and the outer coil O are adjacently wound in the same single pancake coil, and the ampere turns are the same, so that the outer coil O generates a second stray field or a second error magnetic field which is basically the same as the first stray field or the first error magnetic field and completely reverse, thereby fully counteracting the first stray field or the first error magnetic field, and improving the magnetic restraint capacity of the magnetic restraint device.
When both the inner coil I and the outer coil O use a high temperature superconducting material such as YBCO, the height HH of the inner coil I and the height (i.e., thickness) H of the outer coil O are the same. However, considering that the mechanical properties of the existing high-temperature superconducting material such as the YBCO strip are fragile and extremely sensitive to micro-deformations such as bending, extrusion or stretching, the external coil O can be formed by winding a normal-temperature conductive material with excellent mechanical properties such as copper, and the external coil O is formed by winding the external coil I outside the internal coil I, so that good mechanical protection is provided for the internal coil I formed by winding the high-temperature superconducting material, and the micro-deformations such as bending, extrusion or stretching are obviously reduced. In addition, considering that the upper limit of the bandwidth of the band of the existing high temperature superconducting material such as YBCO is about 12mm (millimeters), and in order to improve the protection capability of the external coil O against the physical impact from the outside of the coil and to facilitate the assembly to the magnetic confinement device when the high temperature superconducting pancake coil provided by the present invention is practically applied, the height H of the external coil O may be made larger than the height HH of the internal coil I, fig. 2 is a corresponding schematic diagram, that is, fig. 2 is a schematic diagram of the cross section of the high temperature superconducting pancake coil for the magnetic confinement device when the external coil wound band provided by the present invention is copper, at this time, the relationship between the height H of the external coil O and the height HH of the internal coil I preferably satisfies: (H-HH)/HH is more than or equal to 1/3 and less than or equal to 2/3. In fig. 2, the dashed line represents the symmetry axis of the pancake coil, R1 is the inner radius of the inner coil I, R2 is the outer radius of the inner coil I and the inner radius of the outer coil O, and R3 is the outer radius of the outer coil O.
When the single pancake coil is practically applied, only one single pancake coil is not adopted under the common working condition, and fig. 3 and fig. 4 respectively show the structural schematic diagrams of a second superconductive pancake coil-multi-pancake coil for the magnetic restraint device.
The multi-pancake coils include a plurality of (i.e. more than one) single pancake coils, fig. 3 is a schematic structural diagram of a first multi-pancake coil when a part of magnetic restraint devices to be configured with coils is cylindrical, as shown in the drawing, the first multi-pancake coil includes N single pancake coils A1, A2, …, AN, N are integers greater than 1, the single pancake coils A1, A2, …, AN have the same symmetry axis and are sequentially arranged along the symmetry axis, and the cylindrical magnetic restraint devices penetrate through hollow magnetic flux portions of the single pancake coils A1, A2, …, AN. In fig. 3, D is the distance between adjacent single pancake coils AJ1 (e.g. A1) and aj1+1 (e.g. A2), in order to improve the magnetic field generated by the first multi-pancake coil, to implement efficient magnetic confinement, and satisfy the process requirements of the lead wire when the magnetic confinement device is configured, where D preferably satisfies: d is less than or equal to H/2. Wherein J1 is an integer and J1 is more than or equal to 1 and N-1 is more than or equal to 1. The external coils O of the single pancake coils A1, A2, …, AN are connected in parallel or in series, preferably in parallel, and likewise the internal coils I of the coils A1, A2, …, AN are connected in parallel or in series, preferably in parallel. On the basis that each single-pancake coil reduces stray field or error magnetic field, the first multi-pancake coil adopts high-temperature superconducting strips as coil winding materials, so that the magnetic confinement magnetic field generated by the coils is enhanced, the magnetic field generating efficiency is higher than that of the existing CS coil, fusion or other magnetic confinement devices requiring high plasma flux are realized more favorably, and the design space of fusion reactors and other equipment is expanded.
Fig. 4 is a schematic structural diagram of a second multi-pancake coil when a part of magnetic restraint devices to be configured with coils is in a frustum shape (the spherical and hemispherical magnetic restraint devices can be fitted and approximated by a plurality of frustum-shaped magnetic restraint devices in consideration of the thickness of the single pancake coil), as shown in fig. 4, the second multi-pancake coil comprises NN single pancake coils B1, B2, …, BNN, NN are integers greater than 1, the single pancake coils B1, B2, …, BNN have the same symmetry axis and are sequentially arranged along the symmetry axis, and the frustum-shaped magnetic restraint devices penetrate through hollow magnetic flux portions of the single pancake coils B1, B2, … and BNN. The second multi-pancake coil differs from the first multi-pancake coil described above in that the inner and outer radii R1, R2, R3 of the inner coil I and the outer coil O of each single pancake coil B1, B2, …, BNN decrease in sequence, the specific dimensions being dependent on the size, configuration and magnetic field required of the frustum-shaped magnetic confinement device. Wherein, the outer coils O of adjacent single pancake coils BJ2 (such as B1) and BJ2+1 (such as B2) are O1 and O2 respectively, the inner coils I are I1 and I2 respectively, the inner radius of the inner coil I1 of the single pancake coil BJ2 is RI11, the outer radius is RI12, and the outer radius of the outer coil O1 is RO13, meanwhile, the inner radius of the inner coil I2 of the single pancake coil BJ2+1 is RI21, the outer radius is RI22, and the outer radius of the outer coil O2 is RO23, thereby satisfying that RO23 is less than or equal to RO13, preferably RO23 is less than or equal to RI12, and RI11 is less than or equal to RI22. Wherein J2 is an integer and J2 is more than or equal to 1 and NN-1. In the second multi-pancake coil, the outer coil O2 in the single-pancake coil BJ2+1 counteracts the first stray field or the first error magnetic field of the inner coil I2 and counteracts the first stray field or the first error magnetic field of the inner coil I1, so that the magnetic confinement capacity of the frustum-shaped magnetic confinement device is further improved. Considering that the number of turns of the external coil O and the internal coil I of the single pancake coils B1, B2, … and BNN are required to be sequentially adjusted according to the size, configuration and required magnetic field of the frustum-shaped magnetic confinement device, the external coil O and the internal coil I of each single pancake coil B1, B2, … and BNN are preferably respectively and independently externally connected with an independent power supply, so as to realize accurate control of currents in each single pancake coil B1, B2, … and BNN. In a word, the magnetic field generated by the external coil O2 of the single pancake coil bj2+1 in the second multi-pancake coil can be used for counteracting the stray field or the error magnetic field generated by the internal coil I2 of the single pancake coil bj2, and counteracting the stray field or the error magnetic field generated by the internal coil I1 of the single pancake coil bj2, so that the total stray field or the error magnetic field of the second multi-pancake coil is further reduced overall, the problem that the stray field or the error magnetic field of the frustum-shaped magnetic confinement device is difficult to counteract is solved, and ideal fusion or other equipment requiring high plasma flux is facilitated to be realized.
In summary, the single pancake coil provided by the invention improves the magnetic confinement capability of the high-temperature superconducting magnetic confinement device, and when the external coil O adopts copper and other existing normal-temperature conductor materials, the single pancake coil provides a protection function for physical impact from the outside of the coil and facilitates the assembly of the external coil to the magnetic confinement device. Compared with the existing CS coil, the first multi-pancake coil provided by the invention is more beneficial to realizing fusion or other magnetic confinement devices requiring high plasma flux, and expands the design space of fusion reactors and other devices. In particular, the second multi-pancake coil provided by the invention solves the problem that the stray field or the error magnetic field of the frustum-shaped magnetic confinement device is difficult to counteract, and is beneficial to realizing ideal fusion or other equipment requiring high plasma flux.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A high temperature superconducting pancake coil for a magnetic confinement device, comprising: the single pancake coil is a hollow pancake coil and comprises a hollow magnetic flux part and a coil part,
wherein,,
the hollow pancake coil forms the hollow magnetic flux part from a pancake hollow space with the center extending outwards in the radial direction;
the hollow magnetic flux portion is wound radially outwards with a conductor material to form the coil portion, and the coil portion comprises an inner coil (I) and an outer coil (O);
the inner coil (I) is formed by winding a first conductive strip from inside to outside, a first lead end (L1) is arranged at the inner end of the inner coil (I), a second lead end (L2) is arranged at the outer end of the inner coil (I), and all turns of the inner coil (I) are separated by insulating materials;
the outer coil (O) is formed by winding a second conductive strip outside the inner coil (I) from inside to outside, a third lead end (L3) is arranged at the inner end of the outer coil (O), a fourth lead end (L4) is arranged at the outer end of the outer coil (O), and all the coils of the outer coil (O) are separated by the insulating material;
the first conductive strip is made of high-temperature superconducting materials;
the ampere-turns of the inner coil (I) and the ampere-turns of the outer coil (O) are the same;
the second lead end (L2) and the third lead end (L3) are positioned on the same ramp, the distance between the second lead end and the third lead end is not smaller than the coil turn spacing, and the second lead end and the third lead end are separated by the insulating material, or the second lead end (L2) and the third lead end (L3) are positioned on adjacent ramps or are separated by a ramp;
the second conductive strip is a high-temperature superconducting material or a normal-temperature conductive material,
when the second conductive strip material adopts the high-temperature superconducting material, the height HH of the inner coil (I) is the same as the height H of the outer coil (O);
when the second conductive strip material is the normal-temperature conductive material, the height HH of the inner coil (I) and the height H of the outer coil (O) satisfy the following conditions: (H-HH)/HH is more than or equal to 1/3 and less than or equal to 2/3;
the winding direction of the external coil (O) is the same as or opposite to the winding direction of the internal coil (I), the internal coil (I) is used for generating an axial magnetic field for magnetic restraint, and reverse current is introduced when the winding directions of the external coil (O) and the internal coil (I) are the same, or the same-direction current is introduced when the winding directions of the internal coil (I) and the external coil (O) are opposite.
2. The high temperature superconducting pancake coil for a magnetic confinement device of claim 1,
the normal temperature conductive material is copper.
3. A high temperature superconducting pancake coil for a magnetic confinement device according to any one of claims 1-2,
the single pancake coil is provided with a first top surface and a second top surface which are opposite to each other, and the first lead end (L1) and the fourth lead end (L4) are led out through leads attached to the first top surface or the second top surface and arranged in the radial direction of the coil.
4. A high temperature superconducting pancake coil for a magnetic confinement device according to claim 3,
the single cake coil is N, includes: single pancake coils (A1), (A2), …, (AN), N is AN integer greater than 1,
the single pancake coils (A1), (A2), …, (AN) have the same symmetry axis and are arranged sequentially along the symmetry axis;
-said single pancake coils (A1), (A2), …, (AN) have the same inner (R1) and outer (R2) radii of said inner coil (I) and outer (R3) radii of said outer coil (O);
the single pancake coils (A1), (A2), …, and (AN) are connected in parallel between the outer coils (O) and between the inner coils (I).
5. The high temperature superconducting pancake coil for a magnetic confinement device of claim 4,
and the space between the adjacent single pancake coils AJ1 and AJ1+1 in the single pancake coils (A1), (A2) and … and (AN) is D, and D is less than or equal to H/2.
6. A high temperature superconducting pancake coil for a magnetic confinement device according to claim 3,
the number of the single pancake coils is NN, and the single pancake coils comprise: single pancake coils (B1), (B2), …, (BNN), NN being an integer greater than 1,
the single pancake coils (B1), (B2), …, (BNN) have the same symmetry axis and are arranged in sequence along the symmetry axis;
-the inner radius (R1) and the outer radius (R2) of the inner coil (I) and the outer radius (R3) of the outer coil (O) of the single pancake coil (B1), (B2), …, (BNN) decrease in sequence;
the single pancake coils (B1), (B2), …, and (BNN) are respectively and independently externally connected with independent power supplies.
7. The high temperature superconducting pancake coil for a magnetic confinement device of claim 6,
let J2 be integer and 1 be less than or equal to J2 be less than or equal to NN-1, single pancake coils (B1), (B2), …, adjacent single pancake coils in (BNN) are single pancake coils BJ2 and BJ2+1, the inner radius of an inner coil (I1) of the single pancake coil BJ2 is RI11, the outer radius of the inner coil is RI12, the outer radius of an outer coil (O1) is RO13, the outer radius of an inner coil (I2) of the single pancake coil BJ2+1 is RI22, and the outer radius of an outer coil (O2) is RO23, so that the following conditions are satisfied: RO23 is less than or equal to RO13 and RI11 is less than or equal to RI22.
8. The high temperature superconducting pancake coil for a magnetic confinement device of claim 7,
RO23≤RI12。
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